A geometrical model for the catalogs of galaxies

L. Zaninetti

Dipartimento di Fisica Generale, Università degli Studi di Torino, Via Pietro Giuria 1, 10125 Torino, Italy. (zaninetti@ph.unito.it).

Received 2009 May 7
Accepted 2010 January 6

RESUMEN

La red 3D que se origina por las caras de los polihedros irregulares poissonianos de Voronoi podría representar la estructura básica para la formación de galaxias. En consecuencia, la apariencia espacial de los catálogos de galaxias podría reproducirse. Los catálogos seleccionados para la simulación fueron el 2dF Galaxy Redshift Survey y el Third Reference Catalog of Bright Galaxies. Para explicar el número observado de galaxias con un flujo (o magnitud) dado como función del corrimiento al rojo deben examinarse cuidadosamente las propiedades fotométricas de las galaxias, tanto desde un punto de vista astronómico como teórico. La estadística del volumen de Voronoi normalizado se modela por dos distribuciones, y el super–hueco en Eridanus se identifica como el mayor volumen perteneciente al polihedro de Voronoi. El comportamiento de la función de correlación de las galaxias se simula adoptando el esquema de caras gruesas de polihedros de Voronoi para escalas pequeñas, y conservando los argumentos usuales para escalas grandes.

ABSTRACT

The 3D network originated by the faces of irregular Poissonian Voronoi polyhedra may represent the backbone on which the galaxies are originated. As a consequence the spatial appearance of the catalogs of galaxies can be reproduced. The selected catalogs to simulate are the 2dF Galaxy Redshift Survey and the Third Reference Catalog of Bright Galaxies. In order to explain the number of observed galaxies for a given flux/magnitude as a function of the redshift, the photometric properties of the galaxies should be carefully examined from both the astronomical and theoretical point of view. The statistics of the Voronoi normalized volume is modeled by two distributions and the Eridanus super–void is identified as the largest volume belonging to the Voronoi polyhedron. The behavior of the correlation function for galaxies is simulated by adopting the framework of thick faces of Voronoi polyhedra on short scales, while adopting standard arguments on large scales.

Key Words: galaxies: clusters: general — galaxies: general — galaxies: statistics.

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